Google Play shows Expired date correctly:
Thanks for reaching out, @HopeaKotka! Please submit a request via in-app support. One of our representatives will look into it.
Subscription was expired as expected, I did cancel subscription about week ago. It is just that the date text in App Settings is not shown correctly. So I think this is more like a common App problem and bug rather than a user specific account issue.
Now (12.7 at 13:20, ) the Settings does not have anymore Subscription section at all, also Profile Flair and inventory is back to normal 2000. Seems to work now as expected.
Yesterday Subscription in App Settings showed: Expires 12.7 at 13:09.
It seems that Google Play and App shows "Subscription Expired" 2 or 3 hours before benefits are actually removed from account.
Also invalid text "Subscription Expired Jan 01, 0001 02:01 AM" was shown only during this 2-3 hour period.
This is probably a side effect of earlier reported bug:
@HopeaKotka Upon reviewing your account we could confirm that your subscription has expired. This could be a temporary issue, try refreshing the game data or reinstalling the app and check if that helps.
I think the problem is not that the subscription expired, which seemed intentional, but that the scanner showed a bugged "Subscription expired at" message, which didn't show the actual expiry time, but a date in the early year of 0001 ;)